Rent Increase Calculator

Rent increase calculations help both landlords and tenants understand the financial impact of a percentage or fixed-dollar rent adjustment.

This page takes a rate you already have, usually the one on the renewal letter, and projects it forward. If what you need is the ceiling your local rule sets rather than the number being proposed, the legal rent increase cap calculator works that out from local CPI, the permitted buffer and any hard cap.

Core formulas: New Rent = Current Rent × (1 + Increase Rate) Dollar Increase = Current Rent × Increase Rate Annual Impact = Dollar Increase × 12 Cumulative Rent (n years) = Current Rent × (1 + r)^n

Where:

• Current Rent = the current monthly rent amount
• Increase Rate = the annual percentage increase as a decimal (e.g., 5% = 0.05)
• n = number of years of compounding

Typical rent increase benchmarks (US, 2025):

State rent control laws (selected):

• California: Statewide cap of CPI + 5%, maximum 10%
• Oregon: CPI + 3%, maximum 10%
• New York City: Rent Stabilization Board sets annual allowable increases
• Most states: No rent control, so the market rate applies

Worked example: Current rent: $1,850/month. Landlord proposes a 6% increase. Dollar increase = $1,850 × 0.06 = $111/month New rent = $1,850 + $111 = $1,961/month Annual impact = $111 × 12 = $1,332/year more

After 5 years at 6% annually: Rent = $1,850 × (1.06)⁵ = $1,850 × 1.338 = $2,475/month

Tenant strategy: Research comparable rents (Zillow, Apartments.com) before negotiating. Landlords typically prefer a reliable tenant over a vacancy, and a counter-offer of 3-4% is often accepted.

The arithmetic behind that is worth knowing, because it is the strongest thing you can bring to the conversation. On a $1,850 apartment, the gap between a 6% increase and a 4% one is $37 a month, or $444 over the year. One month of vacancy costs the landlord $1,961 in lost rent, plus turnover: cleaning, paint, a listing, and the days it sits empty while people tour it. Four hundred dollars against two thousand is not a close call, and most landlords have run that number before.

What the calculator shows you. The headline is the rent after your chosen number of annual increases, which is the figure you would pay entering the following year. Below it you get the size of the first increase on its own, since that is the one actually on the table at this renewal, and then the total rent across the whole period compared against what you would have paid had the rent never moved. That difference is the real cost of the escalation clause, and it is usually larger than people guess: five years at 6% on an $1,850 apartment costs $14,143 more than five years at a flat rate.

One thing the model does not attempt is a mid-lease change. Increases here land once a year at renewal, which is how nearly every residential lease works. Month-to-month tenancies are a different animal and can be raised with notice at any point.